#define _CRT_SECURE_NO_WARNINGS 1
#include <stdio.h>

int main()
{
    int a = 0;
    int b = 0;
    int c = 0;
    while (scanf("%d %d %d", &a, &b, &c) != EOF)
    {
        if ((a + b > c) && (b + c > a) && (a + c > b))
        {
            if ((a == b) && (b == c))
            {
                printf("Equilateral triangle!\n");
            }
            else if ((a == b) || (a == c) || (b == c))
            {
                printf("Isosceles triangle!\n");
            }
            else
            {
                printf("Ordinary triangle!\n");
            }

        }
        else
        {
            printf("Not a triangle!\n");
        }
    }

}